1.v-for
直接上代码。
示例一:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
<title></title>
</head>
<body>
<div id="didi-navigator">
<ul>
<li v-for="tab in tabs">
{{ tab.text }}
</li>
</ul>
</div>
<script src="js/vue.js" type="text/javascript" charset="utf-8"></script>
<script type="text/javascript">
new vue({
el: '#didi-navigator',
data: {
tabs: [
{ text: '巴士' },
{ text: '快车' },
{ text: '专车' },
{ text: '顺风车' },
{ text: '出租车' },
{ text: '代驾' }
]
}
})
</script>
</body>
</html>
2.索引
在 v-for 块内我们能完全访问父组件作用域内的属性,另有一个特殊变量 $index,正如你猜到的,它是当前数组元素的索引:
<ul id="example-2">
<li v-for="item in items">
{{ parentmessage }} - {{ $index }} - {{ item.message }}
</li>
</ul>
var example2 = new vue({
el: '#example-2',
data: {
parentmessage: 'parent',
items: [
{ message: 'foo' },
{ message: 'bar' }
]
}
})
另外,你可以为索引指定一个别名(如果 v-for 用于一个对象,则可以为对象的键指定一个别名):
<div v-for="(index, item) in items">
{{ index }} {{ item.message }}
</div>
从 1.0.17 开始可以使用 of 分隔符,更接近 javascript 遍历器语法:
<div v-for="item of items"></div>
示例二:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
<title></title>
</head>
<body>
<ul>
<li v-for="option in options">
<p class="text-success" v-on:click="getindex($index)">text:{{option.text}}--vlue:{{option.value}}</p>
</li>
</ul>
<div v-if="isnan(click)==false">
<span>你点击的索引为: {{ click }}</span>
</div>
<div v-else>
<p class="text-danger">试着点击上方li条目</p>
</div>
<script src="js/vue.js" type="text/javascript" charset="utf-8"></script>
<script type="text/javascript">
new vue({
el: 'body',
data: {
click: 'a',
options: [
{ text: '上海市', value: '20' },
{ text: '湖北省', value: '43' },
{ text: '河南省', value: '45' },
{ text: '北京市', value: '10' }
]
},
methods:{
getindex:function($index){
this.click=$index;
}
}
});
</script>
</body>
</html>
3.在点击事件中取到索引
方法一:添加自定义属性
示例三:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style type="text/css">
a{display: block;}
</style>
</head>
<body>
<div>
<a v-for="(index,item) in items" data-index="{{index}}" v-on:click="onclick" href="http://www.baidu.com">{{ item.text }}</a>
</div>
<input type="text" name="" id="index" value=""/>
<script src="js/vue.js" type="text/javascript" charset="utf-8"></script>
<script type="text/javascript">
new vue({
el: 'body',
data: {
items: [
{ text: '巴士' },
{ text: '快车' },
{ text: '专车' },
{ text: '顺风车' },
{ text: '出租车' },
{ text: '代驾' }
]
},
methods: {
onclick:function(event){
event.preventdefault();
let target = event.target
console.log(target.getattribute("data-index"));
document.getelementbyid('index').value = target.getattribute("data-index");
}
}
})
</script>
</body>
</html>
方法二:直接传入索引值
示例四(和二差不多):
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style type="text/css">
a{display: block;}
</style>
</head>
<body>
<div>
<a v-for="(index,item) in items" v-on:click="onclick($index)" href="#">{{ item.text }}</a>
</div>
<input type="text" name="" id="index" value=""/>
<script src="js/vue.js" type="text/javascript" charset="utf-8"></script>
<script type="text/javascript">
new vue({
el: 'body',
data: {
items: [
{ text: '巴士' },
{ text: '快车' },
{ text: '专车' },
{ text: '顺风车' },
{ text: '出租车' },
{ text: '代驾' }
]
},
methods: {
onclick:function(index){
// index.preventdefault();
console.log(index);
document.getelementbyid('index').value = index;
}
}
})
</script>
</body>
</html>
效果与方法一相同。
如果想直接传索引可以用以下方法:
示例五:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style type="text/css">
a{display: block;}
</style>
</head>
<body>
<div>
<a v-for="(index,item) in items" v-on:click="onclick($index)" href="javascript:void(0)">{{ item.text }}</a>
</div>
<input type="text" name="" id="index" value=""/>
<script src="js/vue.js" type="text/javascript" charset="utf-8"></script>
<script type="text/javascript">
new vue({
el: 'body',
data: {
items: [
{ text: '巴士' },
{ text: '快车' },
{ text: '专车' },
{ text: '顺风车' },
{ text: '出租车' },
{ text: '代驾' }
]
},
methods: {
onclick:function(index){
// index.preventdefault();
console.log(index);
document.getelementbyid('index').value = index;
window.location.href = "http://www.baidu.com";
}
}
})
</script>
</body>
</html>